Yes, the question is phrased poorly and people easily confuse "is an ambulance a vehicle" with "do you agree with banning emergency vehicles in parks". However

Yes, the question is phrased poorly and people easily confuse "is an ambulance a vehicle" with "do you agree with banning emergency vehicles in parks". However if you look at the statistics you'll see a lot of people consider a boats, skateboards, sleds and even RC cars as vehicles.